1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * m52790 i2c ivtv driver.
4 * Copyright (C) 2007 Hans Verkuil
5 *
6 * A/V source switching Mitsubishi M52790SP/FP
7 */
8
9
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/slab.h>
13 #include <linux/ioctl.h>
14 #include <linux/uaccess.h>
15 #include <linux/i2c.h>
16 #include <linux/videodev2.h>
17 #include <media/i2c/m52790.h>
18 #include <media/v4l2-device.h>
19
20 MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
21 MODULE_AUTHOR("Hans Verkuil");
22 MODULE_LICENSE("GPL");
23
24
25 struct m52790_state {
26 struct v4l2_subdev sd;
27 u16 input;
28 u16 output;
29 };
30
to_state(struct v4l2_subdev * sd)31 static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
32 {
33 return container_of(sd, struct m52790_state, sd);
34 }
35
36 /* ----------------------------------------------------------------------- */
37
m52790_write(struct v4l2_subdev * sd)38 static int m52790_write(struct v4l2_subdev *sd)
39 {
40 struct m52790_state *state = to_state(sd);
41 struct i2c_client *client = v4l2_get_subdevdata(sd);
42
43 u8 sw1 = (state->input | state->output) & 0xff;
44 u8 sw2 = (state->input | state->output) >> 8;
45
46 return i2c_smbus_write_byte_data(client, sw1, sw2);
47 }
48
49 /* Note: audio and video are linked and cannot be switched separately.
50 So audio and video routing commands are identical for this chip.
51 In theory the video amplifier and audio modes could be handled
52 separately for the output, but that seems to be overkill right now.
53 The same holds for implementing an audio mute control, this is now
54 part of the audio output routing. The normal case is that another
55 chip takes care of the actual muting so making it part of the
56 output routing seems to be the right thing to do for now. */
m52790_s_routing(struct v4l2_subdev * sd,u32 input,u32 output,u32 config)57 static int m52790_s_routing(struct v4l2_subdev *sd,
58 u32 input, u32 output, u32 config)
59 {
60 struct m52790_state *state = to_state(sd);
61
62 state->input = input;
63 state->output = output;
64 m52790_write(sd);
65 return 0;
66 }
67
68 #ifdef CONFIG_VIDEO_ADV_DEBUG
m52790_g_register(struct v4l2_subdev * sd,struct v4l2_dbg_register * reg)69 static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
70 {
71 struct m52790_state *state = to_state(sd);
72
73 if (reg->reg != 0)
74 return -EINVAL;
75 reg->size = 1;
76 reg->val = state->input | state->output;
77 return 0;
78 }
79
m52790_s_register(struct v4l2_subdev * sd,const struct v4l2_dbg_register * reg)80 static int m52790_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
81 {
82 struct m52790_state *state = to_state(sd);
83
84 if (reg->reg != 0)
85 return -EINVAL;
86 state->input = reg->val & 0x0303;
87 state->output = reg->val & ~0x0303;
88 m52790_write(sd);
89 return 0;
90 }
91 #endif
92
m52790_log_status(struct v4l2_subdev * sd)93 static int m52790_log_status(struct v4l2_subdev *sd)
94 {
95 struct m52790_state *state = to_state(sd);
96
97 v4l2_info(sd, "Switch 1: %02x\n",
98 (state->input | state->output) & 0xff);
99 v4l2_info(sd, "Switch 2: %02x\n",
100 (state->input | state->output) >> 8);
101 return 0;
102 }
103
104 /* ----------------------------------------------------------------------- */
105
106 static const struct v4l2_subdev_core_ops m52790_core_ops = {
107 .log_status = m52790_log_status,
108 #ifdef CONFIG_VIDEO_ADV_DEBUG
109 .g_register = m52790_g_register,
110 .s_register = m52790_s_register,
111 #endif
112 };
113
114 static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
115 .s_routing = m52790_s_routing,
116 };
117
118 static const struct v4l2_subdev_video_ops m52790_video_ops = {
119 .s_routing = m52790_s_routing,
120 };
121
122 static const struct v4l2_subdev_ops m52790_ops = {
123 .core = &m52790_core_ops,
124 .audio = &m52790_audio_ops,
125 .video = &m52790_video_ops,
126 };
127
128 /* ----------------------------------------------------------------------- */
129
130 /* i2c implementation */
131
m52790_probe(struct i2c_client * client)132 static int m52790_probe(struct i2c_client *client)
133 {
134 struct m52790_state *state;
135 struct v4l2_subdev *sd;
136
137 /* Check if the adapter supports the needed features */
138 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
139 return -EIO;
140
141 v4l_info(client, "chip found @ 0x%x (%s)\n",
142 client->addr << 1, client->adapter->name);
143
144 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
145 if (state == NULL)
146 return -ENOMEM;
147
148 sd = &state->sd;
149 v4l2_i2c_subdev_init(sd, client, &m52790_ops);
150 state->input = M52790_IN_TUNER;
151 state->output = M52790_OUT_STEREO;
152 m52790_write(sd);
153 return 0;
154 }
155
m52790_remove(struct i2c_client * client)156 static void m52790_remove(struct i2c_client *client)
157 {
158 struct v4l2_subdev *sd = i2c_get_clientdata(client);
159
160 v4l2_device_unregister_subdev(sd);
161 }
162
163 /* ----------------------------------------------------------------------- */
164
165 static const struct i2c_device_id m52790_id[] = {
166 { "m52790" },
167 { }
168 };
169 MODULE_DEVICE_TABLE(i2c, m52790_id);
170
171 static struct i2c_driver m52790_driver = {
172 .driver = {
173 .name = "m52790",
174 },
175 .probe = m52790_probe,
176 .remove = m52790_remove,
177 .id_table = m52790_id,
178 };
179
180 module_i2c_driver(m52790_driver);
181